Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r17 vs 265/70r17 Tire Comparison Side By Side
  245/70-17 265/70-17 Difference
Diameter inches (mm) 30.5 (774.8) 31.61 (802.8) 1.1 (28) 3.6%
Width inches (mm) 9.65 (245) 10.43 (265) 0.79 (20) 8.2%
Circum. inches (mm) 95.83 (2434.11) 99.29 (2522.07) 3.46 (87.96) 3.6%
Sidewall Height inches (mm) 6.75 (171.5) 7.3 (185.5) 0.55 (14) 8.2%
Revolutions per mile (km) 661.16 (410.83) 638.1 (396.5) -23.06 (-14.33) -3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.72 mph (33.35 km/h)
25 mph (40.23 km/h)25.9 mph (41.69 km/h)
30 mph (48.28 km/h)31.08 mph (50.03 km/h)
35 mph (56.33 km/h)36.26 mph (58.36 km/h)
40 mph (64.37 km/h)41.45 mph (66.7 km/h)
45 mph (72.42 km/h)46.63 mph (75.04 km/h)
50 mph (80.47 km/h)51.81 mph (83.38 km/h)
55 mph (88.51 km/h)56.99 mph (91.71 km/h)
60 mph (96.56 km/h)62.17 mph (100.05 km/h)
65 mph (104.61 km/h)67.35 mph (108.39 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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